With our analytical method optimized and its accuracy verified, we turn, at last, to applying our method to the analysis of samples of Danshen roots. Table 6 provides absorbance values (in mAU) for danshensu and for tanshinone I in wild plants harvested from five different cities in the province of Shandong, China, and in five plants harvested from a single cultivated field in which good agricultural practices that emphasize agricultural sustainability are used.
| Danshen Source | absorbance (mAU) for danshensu |
absorbance (mAU) for tanshinone I |
|---|---|---|
| Wild Samples (Cities in Shandong Province) | ||
| Sanshangou | 21.6 | 123.8 |
| Yuezhuang | 10.3 | 055.3 |
| Dazhangzhuang | 11.8 | 067.6 |
| Pingse | 37.2 | 042.1 |
| Mengyin | 10.0 | 132.0 |
| Cultivated Samples (Lot Number) | ||
| 020208 | 23.4 | 136.6 |
| 020209 | 23.7 | 137.1 |
| 020210 | 23.3 | 137.5 |
| 020211 | 22.8 | 148.0 |
| 020212 | 23.5 | 150.8 |
Investigation 34. Calculate the concentration of danshensu and the concentration of tanshinone I in each sample (as mg analyte/g sample). For each set of samples—wild samples and cultivated samples—calculate the mean, the standard deviation, and the relative standard deviation for each analyte and comment on your results.